These waves have the potential to penetrate 1.5 to 2 inches or more into the body allowing for deep heat and raise your core body temperature from deep inside. (infraredsauna.com)
Experience the luxurious and relaxing massage combined with deep heat therapy. (copacabanahotel.com)
But unlike the relative ease of measuring wind speed and solar radiation, test - drilling to assess deep heat resources prior to building a geothermal power plant is uncertain and costly. (earth-policy.org)